dbo.java

java web开发宝典源代码

package com.yxq.share.dao;

import java.sql.*;

public class DBO {
	private String URL;
	private String classname;
	private String username;
	private String password;
	private CreatePage createpage;
	
	private Connection con;
	private Statement stm;
	private ResultSet rs;
	
	public DBO(){
		URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_FABD01";
		classname="com.microsoft.jdbc.sqlserver.SQLServerDriver";
		username="sa";
		password="";
		createpage=new CreatePage();
	}
	
	private void LoadDriver(){
		try{
			Class.forName(classname);
		}catch(ClassNotFoundException e){
			System.out.println("加载驱动程序失败！");
			e.printStackTrace();
		}
	}
	
	private Connection getCon(){
		LoadDriver();
		try{
	    	con=DriverManager.getConnection(URL,username,password);
		}catch(Exception e){
			System.out.println("创建数据库连接失败！");
			e.printStackTrace();
		}
		return con;
	}
	
	private Statement getStm(){
		Connection con=getCon();
		try{
			stm=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
		}catch(Exception e){
			System.out.println("创建Statement对象失败！");
			e.printStackTrace();
		}
		return stm;
	}

	public ResultSet Search(String sql){
		if(sql==null)
			sql="";		
		try{
			getStm();
			rs=stm.executeQuery(sql);
		}catch(Exception e){
			System.out.println("执行查询方法失败！");
			e.printStackTrace();
		}
    	return rs;
    }
	
	public int Insert(String sql){
		int i=-1;
		if(sql==null)
		    sql="";
		System.out.println("sql:"+sql);
		try{
			getStm();
			i=stm.executeUpdate(sql);
		}
		catch(Exception e){
			i=-1;
			e.printStackTrace();
		}		
		return i;
	}
	
	public int Modify(String sql){
		int i=-1;
		if(sql==null)
			sql="";
		try{
			    
		}
		catch(Exception e){
			i=-1;
			e.printStackTrace();
		}
		return i;
	}
	
	public int Delete(String sql){
		int i=-1;
		if(sql==null)
			sql="";
		try {

		} catch (Exception e){
			e.printStackTrace();
		}			
		return i;		
	}
	
	public ResultSet getCurrentRS(int currentP,String sql){
		if(sql==null)
			sql="";
		rs=Search(sql);
		try{
			if(rs!=null){
				if(rs.next()){
					rs.last();
					createpage.setAllR(rs.getRow());
					createpage.setCurrentP(currentP);
					int pos=createpage.getPosR();
					rs.absolute(pos);
					rs.previous();					
				}			
			}
		}catch(Exception e){
			System.out.println("查询分页数据失败！");
			e.printStackTrace();
		}
		return rs;		
	}
	
	public void closed(){
		try {
			if(rs!=null)
			    rs.close();
			if(stm!=null)
				stm.close();
			if(con!=null)
				con.close();
		} catch (SQLException e) {		
			System.out.println("关闭数据库连接失败！");
			e.printStackTrace();
		}
	}
	
	public String getClassname() {
		return classname;
	}
	public void setClassname(String classname) {
		this.classname = classname;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getURL() {
		return URL;
	}
	public void setURL(String url) {
		URL = url;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public CreatePage getCreatepage() {
		return createpage;
	}
	public void setCreatepage(CreatePage createpage) {
		this.createpage = createpage;
	}	
}